166 BULLETIN OF THE BUREAU OF FISHERIES. 
In the larger streams individuals of this species often attain a length of 2 feet. They may some- 
times be seen frequenting the deeper pools in great numbers. Large schools often follow the tide 
down the lower courses of the rivers, frequently venturing some distance into the brackish water. In 
Coos River 8] specimens, measuring from 250 to 420 millimeters long. were cut off from such a school 
without perceptibly reducing its size. 
Drs. Evermann and Meek record the species from Tsiltcoos Lake and the Siuslaw River as Catos- 
tomus tsiltcoosensis.¢ A much larger series of specimens from both the coastal streams of Oregon and 
from the Willamette and lower Columbia than was accessible to these authors makes it appear that no 
differences exist between examples from the Siuslaw and Tsiltcoos rivers and the lower Columbia. 
Willamette, Nehalem, Siuslaw, Umpqua, Coos, Coquille, Flores, and Sixes river basins. 
MEASUREMENTS OF CATOSTOMUS MACROCHEILUS. 
Columbia River basin. 
Willamette River, Junction City. Willamette River near Corvallis. 
] j j 
Length of body.........- mm..} 380} 318 | 328 | 298 | 308 | 300) 312 322 313 305 287 330 
Length head . BI 2A5 | zoe 245 | 23) | 245 | 235) “25 255) | 2000 24 - 248 
Depth body......- 19 | 520°) 24 | 220 | ©2151 222 | 223 || 20 E23 aleeal 22 222, - 2 
Depth caudal pedunele. - -073 | 08 “OSs ce 075} .078 | 082 | ..075 | .08 -078 | .08 .08 075 
Length caudal peduncle. . - 216 | .145 | .17 -165 | .152 | .16 | .16 -15 -175 | .16 -16 - 165 
Length snout.-....------ Sy fe Se 1) 2 alba) | gall LS: | 512 
Width lower lip- -065 | .063 | .048 | -055 | .05 | .05 | .055 | .04 04 045.045 | .047 - 05 
Diameter eye... --- -033 | .035 | .035 | .033 | .035 | .033 | .033 | .033 | .038 | .035 | .035| .03 - 036 035 
Interorbital width. -| 098 | 095.) .11 | -10 | .10 | .105 | .105 | .10 eiley | Galolss |) Saal -10 -1l 
Depth head.......- -| -165 | .175 | .172 | . 717 | .165 | .18 | .165) .16 en meayty sonlyday |) Baty / - 168 “172 
Snout to occiput. =20) | 223) |. 21 «21- | .185)| .20 ||.195\) -192)}) ..205)) 221 20 21 -195 
Snout to dorsal. . “| 250 | .525 | .51 .495 | .51 | .52 | .495! .49 -485 | .49 -475 | 505 - 50 
Snout to ventral.-....- - 565 | . 58 55 | 575 | .585 | .58 | .55 | .56 - 54 57 -545 | . 565 - 565 
Length base of dorsal. -165)) 17. | 2172 -16 | 165 ~175 | .175'|] .175) .19 -18 - 20 =o) -18 
Length base of anal. -08 | .075 | .08 -075 | .085 | .085 | .08 -085 | .08 -085 | .085 - 08 
Height dorsal. 135 | 145 | .14 -145 | .155 | .135 | .16 -145 | .165) .15 - 145 145 
Height anal... .- 2185+} 222) 2172) |< 19 | .18 | .175 | .185 | -17 -225 | .19 »215 | .20 - 185 
Length pectoral 173 | .195 | .175 
| 
| 
-20 eee 172} .19 | .175| .182] -193] .185] .195 | .177 
| 
| 
Length ventral. 1} 2133 | 114 | 145 14 | .145 | -13° | .142| .182] .14 -142) .145 | .148 . 138 
Length caudal. - «205; ) 23% 1-120 23 | .205) .20 | 21 | 21 -207 | .235) .225) .24 7225 
Dorsal rays..... 14) 14 3l 14) 14 14 15} 13 14 14 15 15 15 
Scales lateral line. ....... 67 68 65 7. 72 72 75 76 73 72 | 68 66 77 
Seales above lateral line. > 13} 14 13 | 16 13 14 14; 13 14 14 14 14 16 
Seales before dorsal.....-..-.-- 36 | 35 35 36 | 36 36 35 36 38 36 35 33 34 38 
| 
lia cae Teen - 
| sco un bier Nehalem River basin. 
Long Tom Creek. Nehalem River, near mouth. 
Length of body........- mum. - 148 | 175) 215 425 303 183} 156 156 146 142 185 178 188 
Ihenpthihea. deeper -25 | .25 -245 | .26 -235 | .232| .24 a2a7 | 224 -25 -235 | .245 | .255 
Depth caudal peduncle S| olty/ -075 | .08 -085 | .08 -082 | .075} .08 08 - 08 - 08 - 08 08 
Width lower lip. ...-- --| -045 |} .055 | .05 -058 | .055 |) .088 | .043}) .045  .045 |; .048 | .045 | .048) .05 
Diameter eye... --. -045 | .04 | .04 | .035 | .035] .038 |) .043 | .042 .04 -043 | .04 - 04 - 04 
Snout to occiput. e212 | -21 Lo) 7192) )' 2192) 21 | <2 2215) 22159), 2215) 9522 21 
Snout to dorsal -- 51 | - 52 -51 | 49 -48 -49 49 -49° | 51 51 - 51 515 
Snout to ventral. -59 | .58 | .535 57 ~572 | . 56 - 565 57 SS. - 56 -595 | . 57 
Height dorsal. -.- -17 17 17 25 135 | .16 -16 165 16) 5) 751) 16) -16 - 162 
Height anal. ..... 18 -18 - 20 | .20 75) |) 15 16 175 | .165 7 165 V7 
Length pectoral.. 
Length ventral... 
Length caudal... 
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Dorsal rays....-- 14 14 14 13 13 13 13 13 13 13 14 13 13 
Seales lateral line. . 70 68 74 68 | 67 70 65 65 U8) 71 70 66 68 
Seales above lateral line. Se 15 15 15 15 | 15 15 15 15 14 | 14 16 13 14 
Scales before dorsal....-....-- 35 32 35 35 | 34 32 32 33 | 31 | 30 34 34 30 
if | 
a Catostomus tsiltcoosensis Evermann & Meek, Bulletin U. S. Fish Commission, vol. Xvir, 1898, p. 68. 
